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DIY Mini-Guitar Amp, only $17, need some design tips

Catwell
I have tried to buy the little guitar amplifier off of various gadget websites, with no luck.
 
Normally I am against building something others already do better, and cheaper. But, in this case, I will have to build my own.
 
I need a little help. I have a reference design, about as simple as you can get. However, I want to add volume control. What do you recommend as a simple way to adjust power at the speaker? (Potentiometer on the speaker?)
 
image
IC1 = TDA7052 NXP Audio Ampifier
C1 = 10uF 25V Electrolytic Capacitor
C2 = 100nF 63V Ceramic Capacitor
C3 = 220µF 25V Electrolytic Capacitor
R1 = 22K 1/4W Resistor
J1 = Standard 1/4" guitar jack
J2 = Pending a good 3.5mm source...
Speaker = 1.5W Loudspeaker
B1 = 9V battery, Lithium rechargable
IC1 = TDA7052 NXP Audio AmpifierTDA7052 NXP Audio Ampifier  ~ $1.4
C1 = 10uF 25V Electrolytic Capacitor10uF 25V Electrolytic Capacitor ~ $0.08
C2 = 0.1uF 63V Ceramic Capacitor0.1uF 63V Ceramic Capacitor  ~ $0.37
C3 = 220µF 25V Electrolytic Capacitor220µF 25V Electrolytic Capacitor ~ $0.16
R1 = 22K 1/4W Resistor22K 1/4W Resistor ~ $0.06
J1 = Standard 1/4" guitar jackStandard 1/4" guitar jack ~ $3.79
J2 = Pending a good 3.5mm source... Assumed $3.79
Speaker = 1.5W Loudspeaker1.5W Loudspeaker ~ $4.09
B1 = 9V battery, Lithium rechargable ~$4.00
For a total of $17.74
 
 
This only used the audio amp IC for setting power, but I was thinking of adding some further amplifying stages after the IC. Thoughts on the best approach?
 
Cabe
 
 
 

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    Hi Cabe,

     

    This IC runs the speaker in a differential or bridge configuration, that's why it can get away with not having a DC blocking capacitor on the speaker. If you want volume control I would recommend to replace R1 with and appropriately valued potentiometer and take the signal input to the chip from the wiper. Due to the amplifier's configuration I wouldn't add the pot on the speaker end, you will get better performance if you add the volume control near the beginning of the signal chain were currents are generally small and little noise will be created by the passive components.

     

    hth,

    Jorge Garcia

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  • 0

    Hi Cabe,

     

    This IC runs the speaker in a differential or bridge configuration, that's why it can get away with not having a DC blocking capacitor on the speaker. If you want volume control I would recommend to replace R1 with and appropriately valued potentiometer and take the signal input to the chip from the wiper. Due to the amplifier's configuration I wouldn't add the pot on the speaker end, you will get better performance if you add the volume control near the beginning of the signal chain were currents are generally small and little noise will be created by the passive components.

     

    hth,

    Jorge Garcia

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